There seems to be something wrong with the terrain based leadership and leadership items:
I had a Level1 Horse Lord holding the items Sir Valor (+3 Leadership Defense), Skeleton Warden (+3 Leadership Defense) and Ismaels relic (+2 Leadership).
The poor guy was attacked and killed in the open, but the overall leadership value was just 8.
I think his +5 Leadership in the open should have stacked with all his items to 13 leadership total in defense, right?!
The gameid is 23960, second battle in turn 10. The game has progressed already and no action is required, but I thought it worthwhile to report the bug, no?!